Email address validation?

Hello list.
I have installed the latest zimbra community edition. I'm starting to do some tests in order to migrate from an exchange server 2003.
In a step of the migration process, I need to forward emails from accounts on zimbra to accounts exchange. The domain used in exchange is a TLD (something like ".local") and all exchange email accounts are user1@local, user2@local, etc.
The problem is that I can not configure the forward becouse zimbra won't let me set user1@local as a destination becouse it is not a valid email address (see screenshot)zimbra.jpg

Is there any way to disable email address validation? Or to allow TLDs?

Although you won't be able to disable email validation (Zimbra only likes valid email addresses), you may be able to workaround the issue from the Zimbra side. On one of your Zimbra mailstores, create the domain "local" and route its mail to the Exchange MTA. Then create an alias domain that is valid that can be used in the Zimbra admin console. Issue all commands as the zimbra user.

You should be able to specify whatever address you want in the forward in the form of "user@local.foward". The address will be translated to "user@local" and routed according to its zimbraMailTransport value.